Insulator.



N0.'865,697. PATENTED SEPT. 10, 1907. R. E. HENDERSON & J. N. KING.

INSULATOR. ,APPLIUATION FILED my 16. 1906.

W .k z, a 4 M Noam: PETERS co UNITED STATE S PATENT OFFICE.

ROBERT E. HENDERSON AND JOHN N. KING, OF LOS ANGELES, CALIFORNIA,ASSIGNORS OF ONE-FOURTH TO E. O. WILLIAMS A ND ONE-FOURTH TO JAMES W,KING, OF LOS ANGELES,

CALIFORNIA.

IN SULATOR.

Application filed i To all whom it mu 1 concern:

Be it known that we, ROBERT E. HENDERSON and Jonx N. KING, citizens ofthe United States, residing at Los Angeles, in the county of Los Angelesand State of California, have invented a new and useful Insulator,

of which the following is a specification.

This invention relates to an insulator particularly intended for usewith telephone, telegraph, electric light or other wires, and its mainobject is to provide for sup- 1 O porting the wire by the engagement ofthe wire with the insulator in such manner as to dispense with the useof ties or binders.

Another object of the invention is to support the wire in such mannerthat it will not slack or draw through the insulator to any materialextent on breakage'of the wire.

Another object of the invention is to support the wire in such manner asto prevent burning or injury of the wire in its attachment to theinsulator.

Another object of the invention is to do away with vibration of the wiredue to the working of the wire on the insulator, such as is liable tooccur when the wire is .mercly tied to the insulator.

The accompanying drawings illustrate the invention.

Figure 1 is an end elevation of the insulator. Fig. 2 is a sideelevation thereof. Fig. 3 is a vertical section on the line 1 in Fig. 1.Fig. 4 is a plan. Fig. 5 is a perspective of the wire, showing the bendit takes when it is secured in the insulator. Fig. 6 is a horizontalsection on the line a' a in Fig. 3.

The insulator comprises a body 1 of suitable material, such as glass,having an internal bore 2 which is screw-threaded or otherwise formed toengage with the usual supporting pin and having a petticoat or flange 2extending below said bore.

A groove 4 is formed in one edge or side of the instilator, the ends ofsaid groove being higher than the middle portion thereof, the groove,for example, being made crescent or are shaped and dipping downwardly 40toward the center or curving upwardly from the center toward each end.The said groove also inclines up wardly and inwardly, and at each end ofthe groove the insulator is provided with a seat or depression 5 in thelower face of the groove and a rise or projection 6 in front of saidseat. Theupper and lower faces of the groove preferably convergeinwardly. The face or side of the insulator in which the groove isformed is preferably more or less flattened, and the portion '7 thereofabove the groove extends beyond or overhangs the portion 8 below thegroove, as shown, so that when the wire is placed against the lower face8 and pressed upwardly, it will encounter the downwardly convex end faceof the overhanging portion 7 and will thereby be guided into the groove4. This lower face 8 of the insulator has an upward taper or backwardinclination, facilitating this insertion of the wire, and this up-Specification of Letters Patent.

bent around in this groove 10.

latentecl Sept. 10, 1907.

Serial No. 317,217.

ward taper is continued around the lower part of the insulator.

In inserting the wire it is grasped by both hands, one at each side ofthe insulator, and pressed upwardly, as stated, against the face 8slipping into the groove, and on further pressure of the wire it ispressed into the groove until it slips or drops into the seats ordepressions 5 at the inner termination of the groove at each endthereof. In this operation the wire 12 conforms, or is bent, to thedownwardly convex shape of the groove, the wire assuming a curvaturesuch as shown in Fig. 5, and this bond in the wire effectually holds thewire against longitudinal displacement, the wire being cramped or boundwithin the groove by reason of this bend, and being held from slippingout laterally by the rise or projection 6 in front of the seats 5. Incase the wire is of minimum diameter, it will slip to the inner end ofthe groove throughout, as indicated in dotted lines in Fig. 3, but alarger wire will be pinched or caught between the converging upper andlower faces of the groove before it reaches this innermost position andwill assume a position somewhat as shown in Fig. 6 and in full lines inFig. 3. This will generally be the case with the sizes ordinarily used,and in this case there is in addition to the cramping action, abovereferred to, a gripping action due to the pinching of the wire in thegroove, the seats or wireretaining parts of the insulator being locatedrearward] y of the plane at the point at which the wire is thus pinched,it follows that the pull of the wire at these seats will continuallytend to draw the wire further back into the groove, so that the strongerthe pull the tighter the pinch, and in case the wire is broken thedownward pull of the wire on the seat also tends to draw the wirefurther into the groove on account of the upward and inward inclinationof the groove. The wire being tightly held it cannot work back andforth, and vibration is thereby prevented.

The insulator is furthermore preferably provided with a groove 10extending around the same substantially in line with the ends of thegroove t, so that in any case where the position of the insulatorrenders the gripping action of the groove 4 insufficient to hold thewire, a tie-wire may be used, said tie-wire being In practice however, atie or hinder need very seldom be used. This groove also enables thepart 9 of the insulator immediately above the same to serve as a watertable, the overhang ing part 7 forming a continuation of this table, anda groove 11 is formed around the insulator above this portion of theinsulator to complete the water table.

What we claim is:-

1. An insulator consisting of a body having a curved groove and having awire-receiving seat at each end of said groove, the top and bottom ofsaid groove converging inwardly.

2. An insulator consisting of a body having a groove in one sidethereof, the ends of said groove being higher than the middle portionthereof, and being provided with wire-receiving seats, the top andbottom of said groove converging inwardly.

3. An insulator consisting of a body fiat on one side and rounded on theother sides and having a groove extending into the fiat side thereof,the said groove having a seat at each end and curving from the middleupwardly toward each end, and the upper and lower faces of said grooveconverging inwardly.

4. An insulator consisting of a body having a groove extending inwardlyand upwardly into one side thereof,

the said groove having a seat at each end and curving from the middleupwardly toward each end and the upper and lower faces of said grooveconverging inwardly, and a groove extending around the insulator in linewith the aforesaid groove, the part of the insulator above said grooveoverhanging the insulator below the groove.

5. An insulator consisting of a body flat on one side and having agroove extending inwardly and upwardly at said flat side, the saidgroove being curved and rising from the middle toward each end andprovided at each end with a wire-receiving seat, the insulator above thesaid groove projecting to form an overhanging upper face for saidgroove.

6. An insulator consisting of a body having a groove extending inwardlyand upwardly at one side thereof, the said groove being curved andrising from the middle toward each end and provided at each end with awire receiving seat and the top and bottom of said groove be inginwardly convergent, the insulator above the said groove projecting toform an overhanging upper face for said groove, and the insulator havinga groove extending around same in line with the ends of the said curvedgroove.

In testimony whereof, we have hereunto set our hand at Los AngelesCalifornia this 10th day of May 1906.

ROBERT E. IIENDE KSON. JOHN N. KING.

In presence of An'rritr. I. KNIGHT, LAURA W. Coon.

